Metal wood club head

• US 6,402,639 B1
• Filed: 03/07/2001
• Issued: 06/11/2002
• Est. Priority Date: 10/28/1999
• Status: Expired due to Term

• Current Assignee: K.K. Endo Seisakusho, Mizuno Corporation
• Original Assignee: Mizuno Corporation
• Inventors: Masuda, Naoyuki, Sakai, Koji, Sugimoto, Kiyoshi, Iwata, Mototaka
• Primary Examiner(s): Passaniti, Sebastiano
• Application Number:
  US09/786,710
• Time in Patent Office: 461 Days
• Field of Search: 473/324, 473/329, 473/345, 473/346, 473/349, 473/342, 473/350, 473/290, 473/291, 473/330, 473/344, 473/327, 473/328
• US Class Current: 473/330
• CPC Class Codes: A63B 53/0408 characterised by specific dimensions, e.g. thickness
• CPC Class Codes: A63B 53/0412 Volume
• CPC Class Codes: A63B 53/0416 Heads having an impact surface provided by a face insert
• CPC Class Codes: A63B 53/0466 wood-type

Abstract

A metal wood club head of a hollow hull structure according to the present invention is such that the vertical difference between a maximum face part height (MFH) from a sole part (4) and a back part height (BH) from the sole part (4) is at least within 25 mm, the height of a crown part (3) having a width of 30% to 70% of a head width from the sole part (4) is substantially identical to the maximum face part height (MFH) or more than that, the vertical difference between a maximum crown part height (MCH) from the sole part (4) and the maximum face part height (MFH) is at least within 8 mm, and the radius (R1) of curvature of the crown part (3) is substantially uniformly within the range of 100 mm to 1000 mm, while it sets the radius (R2) of curvature of the sole part (4) substantially uniformly within the range of 500 mm to 2000 mm, and sets the ratio of thicknesses of the crown part (3) and the sole part (4) within the range of 1.0 to 1.2.

Claims

1. A metal wood club head of a hollow hull structure comprising a face part (2), a back part (9), a crown part (3) forming an upper portion from said face part (2) to said back part (9) and a sole part (4) forming a lower portion from said face part (2) to said back part (9), wherein

the vertical difference between a maximum face part height (MFH) from said sole part (4) and a back part height (BH) from said sole part (4) is at least within 25 mm,

the height of said crown part (3) having a width of 30% to 70% of a head width from said sole part (4) is substantially identical to said maximum face part height (MFH) or more than that, and

the vertical difference between a maximum crown part height (MCH) from said sole part (4) and said maximum face part height (MFH) is at least within 8 mm,

said metal wood club head setting the radius (R1) of curvature of said crown part (3) substantially uniformly within the range of 100 mm to 1000 mm while setting the radius (R2) of curvature of said sole part (4) substantially uniformly within the range of 500 mm to 2000 mm, and

setting the ratio of thicknesses of said crown part (3) and said sole part (4) within the range of 1.0 to 1.2.

2. The metal wood club head according to claim 1, setting the radius (R3) of curvature of a roll of said face part (2) to at least 254 mm and not more than 381 mm and setting the radius (R4) of curvature of a bulge to at least 254 mm and not more than 381 mm.

3. The metal wood club head according to claim 1, wherein the ratio of said maximum face part height (MFH) and a maximum face part width (MFW) is at least 0.5.

4. The metal wood club head according to claim 1, wherein the thickness of said face part (2) is at least 1.0 mm and not more than 3.0 mm.

5. The metal wood club head according to claim 1, wherein the area of said face part (2) is at least 3300 mm² and not more than 7500 mm².

6. The metal wood club head according to claim 1, forming a bulging zone (8) on a top portion of said crown part (3) from said face part (2) to said back part (9).

7. The metal wood club head according to claim 6, wherein the height of said bulging zone (8) is at least 0.1 mm and not more than 4 mm, and the width of said bulging zone (8) is at least 10 mm and not more than 20 mm.

8. The metal wood club head according to claim 1, wherein the material for said face part (2) is a single metal material, and

said face part (2) is molded without performing solution treatment after forging said metal material.